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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8141541d81144f86b0d28b7a82ec4ecd00a5b9d90f4bf60d9662881ec3d25d52' 
  AND token = 'KF2Ru6JbaK/jJw0pMFFEEMt0qgSUR4LsHwakBAOIXeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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