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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19bb6ff1bc0cf0defc1426a37d79fda227d5651c27aceb6c07813c822bdf35ef' 
  AND token = 'lALxz1OvPUW2Dhx2hJVNFr6wNLi2j3p7AaI5FwvtIr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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