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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0522675c1a57ac0e0ae33188807111fd08aa367abb6adf2d1d471254e8d26059' 
  AND token = 'JLF2Rj5f30B/i5bnz+q8gI3i6e1vyggtHoIRwD5jyCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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