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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfb3c7e9f67f133154ecac30de9ac5fefb91916cabbffb13e249f334ac11fc13' 
  AND token = '4Mck08TWYmex1mYuR0mRV7QMbjvmk9o1HDYPDwMV6t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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