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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d23c0a8d4cc0a76a11df7030f693a6f86abf64ab7803fe923214ecd37f1a489' 
  AND token = 'i0yAWgRKFRQNesvOWVgOs9g3LLiPGWhsF560lPWgK5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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