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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '671a9b43f7ae3b0a51dbb5cf6b69bb3fac2dce2e4f03cacd258396941ae42344' 
  AND token = 'Mm5ZerkpHd8ads+9s41xhXT0nkrXOxPKX9vxQmrQ/vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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