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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fcbe9fc52c519ca7138b640a9ee9dee2a8bf54703373713f837e4a0e810bbb4' 
  AND token = 'vxiX6NKnDFa8qVvsH06QanINq1cXRQaQBlRLR/iNGTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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