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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ec7bf9b83a9f4e57d23d993ee8d36b1c16a094fb4da040d330e3f77ea6acba2' 
  AND token = 'I9hSNkyOKpWglUqgAadaM/djYcbMnRa6P7t7xpKWIeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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