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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc1af700036bc27ad45c6d6e04e5a7a23a1529c788b33dff576a7d10b195e07e' 
  AND token = 'mXgMVO371WbiN5lVIphLhzBaMGaeJZL8T0NEoz5MEBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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