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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0ce3ca77b4c4e8c2913143b271fe25a0e7e97dfa46237ef3828c02f764f3fc6' 
  AND token = 'WLFfSggWU4WZ3D41roTLRrzGD4iYlJbXHY3ie92+DKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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