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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70091f8897f66f514cb62b7f75c50e143caf6d22fdc8e9c150ff6779e1f094d2' 
  AND token = 'rJPyQ7JBZjkjYSs4BDuOx+Rg18Xg4r740qsllUI2eys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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