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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd013b5c74f0fe7d6c924badaf20f5a560d2b69921562c7513ed24b0d25bf42af' 
  AND token = 'GI5SnPfZoj3beFyPqoSvVlN3NVVrpoDV0h00VoJeH+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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