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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02784e2e3b452412d7e2ae0a7e2dcb99f4c9b48d9acbfcf03f65f3e246e7ff05' 
  AND token = 'pLZ5IfkvfZTpkrb5rocil/lzKTCPqQIhIveuI+Su5pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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