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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '749232773a0d1337d532e282c8374b0e91e36215e7c851508e4c525554bfa14d' 
  AND token = 'YNzK17KeACENoK9mVvsNIHABKqWek6JYgOsWsQ8dsyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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