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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05ffef9aeed7dc9fbe6c820265c3b869a8038c6c276bd3ec5609647ed0c2fb66' 
  AND token = 't/uKMLeJ2uXO+wCELMWuI3UxVUjyImZ3cL68QSToP/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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