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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bbc9f7b73f9d3ba0b4eefb449a74ac0a86836d230985526c6ba6732647ac142' 
  AND token = 'm56Wkih9/vXFlQAlHZcE6nlmL7Vnfi1ID1nWQ+j4RJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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