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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77a2ae5b2619ee84736b7428f748efbffff45abdcd5bba4e0015a15d6c49034e' 
  AND token = 'fGptdk4thwQESeOI2LHgFLzY9ZNaRScNtp7fjZbebJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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