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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2a4e39f251ca3f3b42676f9b37019932175da68d7f9df13420feb72f9d012bd' 
  AND token = 'YE6En1wZxOlOSa31/J61snaWhH40Obbf8lp4syYWQqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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