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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '621c5076a5181b9a040dd46d812414ad6be10c857b0f8cf112f23fc89f7bdea4' 
  AND token = 'DI5D/ddJdVIdYxNCqK0jAxCryU3NrdxvvgyHetvvsJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00370

JSON explain

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