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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8f7e190cdc3278612e6da8621f6d5570c4690e72847d924b4d7ead0e67e632c' 
  AND token = 'Cu09y4pastCQqzFrZXUsaLbqq7UAJ6UQF4ILhgjGrHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}