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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46fe8a86da806c20cb036518407f374ea575da4463761cacfaf0702ff3a18575' 
  AND token = 'FkmJL3lJhLax0VPkKQW57MwJ0SJLCFfQLsX0Tf8iEhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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