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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ec93e3da9fe293975451f5838dd482573b4f873ee991d50b4f188b55b0277fd' 
  AND token = '2vA+ILV935DYsXgZC69zHQj3UgSApk0PPo3FHiK8wo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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