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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5b60c4d7670ea676ef3246cee129f1a2322561d785778752374e04304523aad' 
  AND token = 'PdULf5W+YA6/BnieY9CCFMP/wgz4pylxD5cBWZjLpls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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