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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9676c4edb93f40ca220a45ae2a1976b4475af567d2be63d3236ee2ac4d5c3e58' 
  AND token = 'XZBpBGgeNVZ5zTSSEBwwKHW+OGA1tM3lMsRttcSdBWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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