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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f6bd761b002ea1e8aeba437e269f29f8fc2a8a1846ea2ef02216f4ca04a5b0' 
  AND token = 'jthB2OA1c8gOUFaVvr7ETP8gQNF87sg/tHmd3S81xKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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