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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1a0fc56e51afbf278b6b3b7eae01472def6e5eaf88af9222739734caeb7336c' 
  AND token = 'XZL9kBLpLkumF4felJiN1I37X/RYmzJ/ZFBwLg3qfI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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