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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1715940304b11b3f01d8800cf882a706a65f44c9c791df6fe84bf3c96e171c98' 
  AND token = 'wtg9C4GHev+FSnydx+swFv/SjT1uT/cAHw9/WJtog8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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