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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '581496b2ece343459d22fc0771c50479c4d1cd13866255e0dc37eeda2e535141' 
  AND token = 'nync+b6gwmBVaa091vrSnge3JcFfXBHHH1Q6JwzgqAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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