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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e46634956afc1c5b08a502ade9c059c60642f945084cb0dbfb81d3966fdd9185' 
  AND token = 'ABKK5Aos3cc3ORRxEI+GI69xOUZhCmYFCaZEe0YGqsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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