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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a45d6c4b6e478af446435c2a1516896e9b394c90289c91a1bd20c67ca2ddfe' 
  AND token = 'kLhAQca954ESq/1QFfizpbbv81zwpgWce+Ruy56/uSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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