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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d8f870fea5a78803f8cc1c229c227425543a0d92d47608c519bd7eace9339e2' 
  AND token = 'pU8XsBCMvewNH2y0LGbVBZasISeowJkOc7NYagnN6Kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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