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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aefa8324685e3ec1c98f3ecbf71be16fc18fe62aeb67a0881896e87bc4544f4' 
  AND token = 'I1wntctSeI1zzIy+BVEEQhcfX/KvUMRMUxdfW/x/a8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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