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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30578e17b85a579b88f8f0ec4723ce621e047f69155b807c4ddf1000459d4af6' 
  AND token = 'BRMsj1AXF1UR7wPdAfMB11HlKL/SejLwPIUvmbFM3Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00140

JSON explain

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