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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f13aee43d7a72b1661ad8d82f18aed4920b37c66c1034026eacfb19f98ca275' 
  AND token = 'AdsNMAcKvlmhYfUzv7eS7J0s0kcKB+mOG6+n37ssLGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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