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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70af73d5435451e15a0862ec53fae1017a9220e73ac0196cd40d6297d8727d35' 
  AND token = 'P5yrEg5KY4rWs15q/it3i7l5HyA+mnL9C1638ALPT0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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