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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '844b0a6631d0484b5c5e1d83a1a11b931b7eb29f05710bbf1d5ca821d000f09a' 
  AND token = '/bbQ4AFFnLmfukD3YZ2dHjlqsMt6MsffvSV9xBt/+FY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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