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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed4bfdb171031f544538b40d6c7e2a85bba9aecb74871126c04aa44318d8f2b2' 
  AND token = 'azM+Vh2hrm7CzkKAYk3NQHu1idMRe0esjOwVqfSHiNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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