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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '176a6463289ffc3ba04fd0a4e4853cf1c8c80a1d2250752621498de2ae8d0050' 
  AND token = 'qCg5TYr2JXvspt1JPLFcFcHt09Oq6Qew1inW6dWBxRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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