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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd2e06f5c299afbd3552d92800141463c51c1f13f5188343f8cebe7c7c63cd14' 
  AND token = 'xA/qJMEN9nHlqiHFk94DaMYemxnMRGPX7j4zweh0TWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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