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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0bb17ea5ae3ccc901cf507f615c0e745932f2f7f2f950d8f58a404c460a65ae' 
  AND token = 'Fhtk9+03JG/U9GNlcUUVYoV/nHn2LhhgyzahIgRay6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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