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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2f34e0f0de236734e46dd52a56dcc3030f8b1b5bfdb402db036c4b4a7dca24' 
  AND token = 'G68YjM04o9edhTx9ZyloCeMhYpc+GFrvsHzxFHp821s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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