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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cde6a8abe47768c72ab5194ac20d1a595c6aca1286f0cddfba7ffd5108023ee1' 
  AND token = 'hsP+Aah8IXXl7AezM1Rw4NPbtQklS538O8eA8gIVL3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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