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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3255e4d466672128100d3985e7ceee336e6fdd01a9dacc5e4ce4d759101ec98' 
  AND token = '17Vhq9YhEaKPRwI2BaTcLxbkoKdSePIPISqyAfD+f3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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