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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f23ec34ef4b134cce404a9c04b7e84aa03c5bff467cf3be224a7b5d3eab2a9b6' 
  AND token = 'NXL7/+H+j9S+Ui5+yfzFjxvsqIjiLXEaR/GjOl2LpJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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