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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2831d2654519aca7e4bb74ab2c76e6d42ff54fb33c607f749ac7cab3daddfe1a' 
  AND token = 'dR2xmvGtmxKjK7I/rH4Lbjzd8bdLFtSw4xyP00iDtE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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