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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b94dd0c52c0c8434a75892e1287317fb1a42efd123c29a7b78fb56f929369595' 
  AND token = 'Do7p1sV0n9l1OffbAyqyNuGXyPlTB4M3+9sTqGSPoOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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