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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '330de1c25fe62ed9ddd229fd96385a6ff4d3e7444304703423628afecf1f29d8' 
  AND token = 'G/N/CEDmTFW1yFmILhxYY5sLk1E4/oh2jycX+/07rzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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