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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d612a97ddbca3f31cf63f6c5b614eb78f51176753868bf895c479250ad22694' 
  AND token = 'xxp1StE+D3GujleuXMEwgjTSiC47xyEXfbINK6S7ids=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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